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Fiberglass and Lexan/PETG in a home oven? Answered

I'm looking to make a helmet here soon, but, I need to make a visor for it. I know I can use a heatgun to shape Lexan/PETG, however, I have heard that using an oven is a better choice. My question being, if a fiberglass mold/template save to put in an oven? It would be a pepakura process mold.

After reviewing some steps, I need to amend another question onto this: would it be better to use another material for a model? Again, I would be using a home oven, and using PETG/Lexan. The new material would have to be castable, as I would make a positive mold of the inside of the visor, to composite for the thickness of the PETG/Lexan.